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    <title>47 ES6引入npm包</title>
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    <!--
        1. 安装工具 babel-cli babel-preset-env browserify(webpack)
            npm init --yes
            npm i babel-cli babel-preset-env browserify -D
        2. 转换
            npx babel js -d dist/js --presets=babel-preset-env
        3. 打包 npx browserify dist/js/app.js -o dist/bundle.js
    -->
    <script src="./dist/bundle.js" >

    </script>
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